How Your Blood Type Can Affect Your Health (WebMD Summary)

Your blood type may influence more than just transfusions—it can also affect your risk for certain health issues.

Stomach Cancer
People with blood types A, B, or AB are at higher risk than type O. Type A individuals, in particular, are more prone to H. pylori infection, which can lead to inflammation, ulcers, and eventually cancer.

Ulcers
Ironically, while type A may have higher cancer risk, type O is more prone to peptic ulcers—painful sores in the stomach or intestines.

Blood Clots & Stroke
Blood types A, B, and AB are more likely to develop venous thromboembolism (VTE)—blood clots in deep veins that can travel to the lungs. AB types may also have a higher stroke risk, possibly due to clotting tendencies.

Diabetes & Heart Disease
Type 2 diabetes appears more common in blood types A and B. Type O, however, seems to have a lower risk for heart disease—possibly due to lower cholesterol and clotting protein levels.

Fertility
While blood type doesn’t determine pregnancy chances, one study linked type O with fewer healthy eggs in women, suggesting a possible link to lower fertility.

Memory & Stress
A small study found people with AB blood were more likely to have memory issues. Meanwhile, type A individuals naturally produce more cortisol, making stress harder to manage.

Malaria Resistance
Type O blood may offer some protection against malaria, as the parasite struggles to attach to type O red blood cells.

Knowing your blood type may help you understand your health risks and guide preventive care.